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OpenStudy (anonymous):
Can anyone help me get started on finding the solutions to the equation (cosx)^2+cosx-2=0 which x lies in the interval [-2 , 2 ].
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OpenStudy (johnweldon1993):
Hint* It can be factored
OpenStudy (johnweldon1993):
\[\large cos^2(x) + cos(x) - 2 = 0\] Think of it as \[\large x^2 + x - 2 = 0\]
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